The Great Maine Bike Swap, an annual event for people to sell and purchase used bicycles, will take place from 10 a.m. to 2 p.m. Sunday, April 14, at University of Maine’s New Balance Student Recreation and Fitness Center on the Orono campus.

Produced by the Bicycle Coalition in partnership with the University of Maine, the Orono swap attracted more than 500 people last year.

Hundreds of used bicycles of all types will be for sale, including mountain bikes, road bikes, classic cruisers, kids’ bikes and hybrids. And large test-riding area will allow shoppers to try out bicycles and advisors will be on hand to help with pricing and bike fit.

New this year, sellers can register their bikes before the swap on an online bike registration system at bikemaine.org/swap, which will shorten drop-off lines.

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Admission is $3, with free admission for students at UMaine, the University of Southern Maine, the University of New England and Southern Maine Community College, as well as children 12 years old and younger.

Those wanting to sell bicycles should register the bikes online and then drop them off 6-8 p.m. Saturday, April 13, at the New Balance Student Recreation Center; or 8-10 a.m. on the day of the swap. Saturday drop-off is highly encouraged to minimize lines.

A 15 percent commission on bike sales will support the Bicycle Coalition’s work to improve bicycling in Maine.

The Great Maine Bike Swap in Portland is set for 10 a.m.-2 p.m. April 28 at University of Southern Maine’s Sullivan Gym.

The coalition is seeking volunteers to offer their expertise and time at the two events. Volunteers are involved with everything from helping customers choose a bike to registering and running bikes and helping in the test-ride area.

For information about both swaps or to volunteer, visitbikemaine.org/swap or call 623-4511.